Fix cancelling ProjectileHitEvent for piercing arrows

Piercing arrows search for multiple entities inside a while
loop that is checking the projectile entity's removed state.
If the hit event is cancelled on the first entity, the event will
be called over and over again inside that while loop until the event
is not cancelled. The solution here, is to make use of an
already-existing field on AbstractArrow for tracking entities hit by
piercing arrows to avoid duplicate damage being applied.

== AT ==
protected net.minecraft.world.entity.projectile.Projectile hitCancelled

paper-server/patches/sources/net/minecraft/world/entity/projectile/AbstractArrow.java.patch

@@ -115,7 +115,29 @@
  
                      this.hasImpulse = true;
                      if (this.getPierceLevel() > 0 && projectiledeflection == ProjectileDeflection.NONE) {
-@@ -356,8 +381,8 @@
+@@ -317,8 +342,21 @@
+ 
+             this.level().addParticle(ParticleTypes.BUBBLE, pos.x - vec3d1.x * 0.25D, pos.y - vec3d1.y * 0.25D, pos.z - vec3d1.z * 0.25D, vec3d1.x, vec3d1.y, vec3d1.z);
+         }
++
++    }
+ 
++    // Paper start - Fix cancelling ProjectileHitEvent for piercing arrows
++    @Override
++    public ProjectileDeflection preHitTargetOrDeflectSelf(HitResult hitResult) {
++        if (hitResult instanceof EntityHitResult entityHitResult && this.hitCancelled && this.getPierceLevel() > 0) {
++            if (this.piercingIgnoreEntityIds == null) {
++                this.piercingIgnoreEntityIds = new IntOpenHashSet(5);
++            }
++            this.piercingIgnoreEntityIds.add(entityHitResult.getEntity().getId());
++        }
++        return super.preHitTargetOrDeflectSelf(hitResult);
+     }
++    // Paper end - Fix cancelling ProjectileHitEvent for piercing arrows
+ 
+     @Override
+     protected double getDefaultGravity() {
+@@ -356,8 +394,8 @@
  
      protected void tickDespawn() {
          ++this.life;
@@ -126,7 +148,7 @@
          }
  
      }
-@@ -386,9 +411,9 @@
+@@ -386,9 +424,9 @@
      }
  
      @Override
@@ -138,7 +160,7 @@
          }
      }
  
-@@ -423,7 +448,7 @@
+@@ -423,7 +461,7 @@
              }
  
              if (this.piercingIgnoreEntityIds.size() >= this.getPierceLevel() + 1) {
@@ -147,7 +169,7 @@
                  return;
              }
  
-@@ -440,11 +465,18 @@
+@@ -440,11 +478,18 @@
              entityliving.setLastHurtMob(entity);
          }
  
@@ -167,7 +189,7 @@
          }
  
          if (entity.hurtOrSimulate(damagesource, (float) i)) {
-@@ -490,7 +522,7 @@
+@@ -490,7 +535,7 @@
  
              this.playSound(this.soundEvent, 1.0F, 1.2F / (this.random.nextFloat() * 0.2F + 0.9F));
              if (this.getPierceLevel() <= 0) {
@@ -176,7 +198,7 @@
              }
          } else {
              entity.setRemainingFireTicks(k);
-@@ -506,7 +538,7 @@
+@@ -506,7 +551,7 @@
                          this.spawnAtLocation(worldserver2, this.getPickupItem(), 0.1F);
                      }
  
@@ -185,7 +207,7 @@
                  }
              }
          }
-@@ -538,7 +570,7 @@
+@@ -538,7 +583,7 @@
              Vec3 vec3d = this.getDeltaMovement().multiply(1.0D, 0.0D, 1.0D).normalize().scale(d0 * 0.6D * d1);
  
              if (vec3d.lengthSqr() > 0.0D) {
@@ -194,7 +216,7 @@
              }
          }
  
-@@ -675,7 +707,7 @@
+@@ -675,7 +720,7 @@
          }
  
          if (nbt.contains("weapon", 10)) {
@@ -203,7 +225,7 @@
          } else {
              this.firedFromWeapon = null;
          }
-@@ -688,34 +720,31 @@
+@@ -688,34 +733,31 @@
          Entity entity1 = entity;
          byte b0 = 0;
  
@@ -250,7 +272,7 @@
          }
  
          this.pickup = entityarrow_pickupstatus;
-@@ -724,9 +753,24 @@
+@@ -724,9 +766,24 @@
      @Override
      public void playerTouch(Player player) {
          if (!this.level().isClientSide && (this.isInGround() || this.isNoPhysics()) && this.shakeTime <= 0) {